mirror of
https://github.com/vale981/ray
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60d4d5e1aa
* Remove all __future__ imports from RLlib. * Remove (object) again from tf_run_builder.py::TFRunBuilder. * Fix 2xLINT warnings. * Fix broken appo_policy import (must be appo_tf_policy) * Remove future imports from all other ray files (not just RLlib). * Remove future imports from all other ray files (not just RLlib). * Remove future import blocks that contain `unicode_literals` as well. Revert appo_tf_policy.py to appo_policy.py (belongs to another PR). * Add two empty lines before Schedule class. * Put back __future__ imports into determine_tests_to_run.py. Fails otherwise on a py2/print related error.
41 lines
1.2 KiB
Python
41 lines
1.2 KiB
Python
import logging
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import random
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from ray.rllib.offline.input_reader import InputReader
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from ray.rllib.utils.annotations import override, DeveloperAPI
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logger = logging.getLogger(__name__)
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@DeveloperAPI
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class ShuffledInput(InputReader):
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"""Randomizes data over a sliding window buffer of N batches.
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This increases the randomization of the data, which is useful if the
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batches were not in random order to start with.
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"""
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@DeveloperAPI
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def __init__(self, child, n=0):
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"""Initialize a MixedInput.
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Arguments:
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child (InputReader): child input reader to shuffle.
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n (int): if positive, shuffle input over this many batches.
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"""
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self.n = n
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self.child = child
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self.buffer = []
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@override(InputReader)
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def next(self):
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if self.n <= 1:
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return self.child.next()
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if len(self.buffer) < self.n:
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logger.info("Filling shuffle buffer to {} batches".format(self.n))
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while len(self.buffer) < self.n:
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self.buffer.append(self.child.next())
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logger.info("Shuffle buffer filled")
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i = random.randint(0, len(self.buffer) - 1)
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self.buffer[i] = self.child.next()
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return random.choice(self.buffer)
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